I respectfully disagree with your assessment about others. To say, "if someone is inordinately interested in ones age means they have no understanding about old souls" has not been true with my personal experience. Personally I don't believe "old souls" actually means anything. The phrase old soul is a bit of a misunderstanding if you really think about it. Neither having been born or having ever really died, how can being ageless make you old?
Yogananda once described tapping into something as, "ever-new bliss." Is that the real nature of our Soul?
I think labels will always be to the benefit for SELF and the intimate journey with it.